Given the task definition and input, reply with output. In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

The guinea pig or domestic guinea pig ( " Cavia porcellus " ) , also known as cavy or domestic cavy , is a species of rodent belonging to the family Caviidae and the genus " Cavia " .

Guinea pigs are " Cavia porcellus " , a kind of rodent .